/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.teiid.query.function.aggregate;

import java.util.List;

import org.teiid.UserDefinedAggregate;

/**
 * Internal extension of the user defined aggregate interface so that we can expose the internal
 * state.  TODO: this should be exposed eventually for implementors
 * @param <T>
 */
public interface ExposedStateUserDefinedAggregate<T> extends UserDefinedAggregate<T> {

    List<? extends Class<?>> getStateTypes();

    void getState(List<Object> state);

    int setState(List<?> state, int index);

}
